CVE-2026-27197Network attack vector

Account takeover via inactive SAML identity reassignment

Published Feb 21, 2026 · Updated Feb 21, 2026

Improper authentication in Sentry 21.12.0 through 26.1.0 allows remote authenticated users to take over accounts through malicious SAML SSO. The SSO login pipeline reassigns an inactive user's existing AuthIdentity instead of routing it through email, membership, and confirmation checks. Exploitation requires the victim's email address, another organization on the same instance, and control of that organization's SSO settings; successful login grants the victim's account access.

CVSS severity9.1
Critical
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Sentry 21.12.0 through 26.1.0 allows remote authenticated users to take over accounts through malicious SAML SSO. The SSO login pipeline reassigns an inactive user's existing AuthIdentity instead of routing it through email, membership, and confirmation checks. Exploitation requires the victim's email address, another organization on the same instance, and control of that organization's SSO settings; successful login grants the victim's account access.

The record

CVE
CVE-2026-27197
Published
Feb 21, 2026
Updated
Feb 21, 2026
Vendor
Sentry
Product
Sentry
Classifications
CWE-287, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 21.12.0, < 26.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Sentry · Sentryversion=>= 21.12.0, < 26.2.0

Published CVSS scores

9.1GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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